<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>bootstrap-全局样式-按钮</title>
    <link rel="stylesheet" href="./bootstrap/css/bootstrap.css">
</head>
<body>
<button type="button">按钮1</button>
<button type="button" class="btn">按钮2</button>
<button type="button" class="btn btn-success">按钮3</button>
<button type="button" class="btn btn-danger btn-sm">按钮4</button>
<button type="button" class="btn btn-success btn-lg">按钮5</button>
</body>
</html>
